After the nationwide success of "Girls Next Door," puffins is no longer mostly known as the magnificent sea bird, but rather the pet name for Hugh Hefner used by the girlfriends of Hefner on "Girls Next Door." term used out of true love.

"awww puffins, come here baby"

"puffins, let's go have sex"
"...well come on, girls, i have some time before we crochet at the mansion with barbara walters"

Something a little better in functionality than what happens to be the most popular form of the thing in question.

Comes from the fact that a puffin is a black and white bird adapted for both swimming and flying, whereas a penguin is also a black and white bird but is only adapted for swimming, and yet is far more popular than a puffin is.